The bacterial flora in the teat duct of ewes can protect against and can cause mastitis Ilectra A. Fragkou, Vasia S. Mavrogianni, Peter J. Cripps, Dimitris A. Gougoulis and George C. FthenakisVet. Res., 38 4 (2007) 525-545DOI: https://doi.org/10.1051/vetres:2007014